Internal-combustion engine



E. O. ATWOOD INTERNAL COMBUSTION ENGINE Filed June 26. 1922 Patented Aug. 14, 19253.

ERNEST ATW'OOD, OF BOISE, IDAHO, ASSIGNOB, BY MESNE ASSIGNMENTS, OF ONE-HALF TO A'IWOOD GAS SAVER COMPANY, 15. CORPORATION OF IDAHO, AND ONE-HALF TO J. W. IKEHARGUE, BOTH 0F BOISE, IDAHO.

I rnrnnnan-cotrsosrron ENGINE.

T 0 all whom it may concern:

Be it known that L'EnNnsr O. Arwoon,

a citizen of the United States, residing at Boise, in the county of Ada and State of Idaho, have invented new and useful Im provements in Internal-Combustion Engines, of which the following is a specification.

This invention relates to internal combustion engines and particularly to means for admitting auxiliary air to the combustible mixturelconduit at a point between the mixing chamber and the carbureter and the cylinders of the engine.

The present invention isa modification of the device described and claimed, in my companion application No. 493038, filed.

check valve, the particular invention covered in. said appl cation 'belng the means and 'method of constructing a gasket as aforesaid, and involving novel features of stamping the gasket and aflixing the check valve thereto.

In the present invention it is contemplated thatthe same structural features may be applied to the flanges themselves of the carbureter or manifold. thereby not only extending the application of the invention to a variety of devices, but also attaining a new function for the apparatus which is not appreciably performed by the modification embraced in said gasket, namely the heating of the auxiliary air by contact with the walls of the long bore or channel extending through the mass of one of said flanges and in whichthe air check valve is confined.

The present invention, then has for its object the provision of means for admitting air to the mixture conduit of an internal combustion engine through a bore or channel extending through the flange of one of the flanged elements of said conduit from i the peripheral edge thereof to the central gas aperture, the latter being serrated, with the same objects in view as attend the similar construction described in said companion case.

For the attainment of these ends and the accomplishmentof other new and useful objects, as will appear, the invention consists ffpplication filed June 2c, 1922. Serial no. 571,002.

in the features of novelty in the construction, combination and arrangement'of the several parts generally shown in the acco1n 'panying drawings, described in the specification, but more particularly pointed out in the appended claims. J

In the drawings accompanying and forming a part of this specification, and wherein the preferredembodiment of my invention is illustrated Figure 1 is a perspective view of a can bureter showing the auxiliary air valve and the serrated gas aperture constructed in the flanged portion thereof.

Figure'Q is an end view of said flanged portion'showing the auxiliary air valve in section.

Figure 3 is a detail View of the flange of the carburetor showing the auxiliary air valve applied thereto in a slightly different 7 manner from that illustrated in Figure 1.

Figure 4 is a perspective view, in side elevation, of an intake manifold showing a flange construction similar to that of Figure 1. '1

Figure 5 is a detail view of the lower end of the intake manifold showing the exhaust valve applied thereto in a manner similar to that illustrated in Figure 3.

Referring now in detail to the several figures, the numeral 1 represents the casing of the float chamber of a carburetor, which communicates with a mixing chamber 2 havmg an air intake 3 which is shown as connected to the hot air stove 4 overlying the exhaust pipe 5. By this means heated air is drawn into the mixing chamber of the carbureter past the lower end of the needle valve 6, in a manner which is well understood and needs no further description. The outlet end of the mixing chamber is provided with a vertical flange 7 which is .adapted to be placed in abutment with the flange 8 of the intake manifold 9 shown in Figure 4;. a gasket. not shown, intervening, and said flanges being bolted tightly together in clamping relation to said gasket by means of bolts passing through the aligned apertures 10.

In my companion application I have pr0- vided the gasket which is interposed between these flanges when the mixture conduit is in assembled relation with an auxiliary air valve, In the present invention I have provided the flanges themselves with the auxiliary air valve. 1 have also included in the flange construction the serrated gas passage which is described in my said companion application and also in application No. 493,038, filed August 17, 1921.

To this end, and referring first to the form of construction shown in Figures 1 and i, I have cast the flange oi. the carbureter with a central opening having serrated walls 11, said flange being also cast with a depressed channel Hextending from the central gas passage to the peripheral edge of said flange. \Vithin this channel is seated the auxiliary air valve 13 which is originally of tubular formation, the lower part of which is seated in said channel and then flattened by pressure to conform to the shape of said channel and to become fitted in tight relationship to the walls thereof. As described in said coinpanion application the act o't flattening the lower portion of said tube also servesthe ,"PHZPOSQ 0t retaining in place the spring i l and the ball 15. shown in Figure 2 by means of which the air-inlet opening 16 111 the end or said tube is controlled. By the disposition of the auxiliary valve inthe manneraforesaid the lower or stem portion thereof is in contact with a relatively extensive sur face of the flange casting and therefore is subject to a rapid rate of heat interchange throughconduction from the metallic mass of said flange. It will be observed that the carbureter obtains itsmain supply of air from the heated air stove 4: which overlies the exhaust pipe 5, therefore the casting of the carbureter is maintained relatively warm during the operation of the engine, the heat from which, conducted through the mass of the flange to the stem of the auxiliary air valve will warm the current of incoming auxiliary air, maintaining a state of vaporizati'on oil the fuel mixtur in the manitold and preventing condensation of the fuel constituent out of said mixture at the point where the auxiliary air enters, as would be the case were the auxiliary air admitted in a cold state.

In prior constructions where an auxiliary -air valve has been attached to the wall of the gas conduit it has been tapped into said conduit normal to the surface of the walls thereof at a point where the walls are thinnest, affordinga metallic; contact between the walls and said air valveot small area, being merely ,the annular ring of contact where said auxiliary air valve passes through the wall of ,said conduit and providing but a negligible heat-conductive surface.

It is not necessary to thecarrying out of the present invention that the stem of the auxiliary airvalve be squeezed into the channel in the flange 7 as has been described. but it may be secured to said flange in any otherv way, the essential feature being that the auxiliary air shall traverse the lengthy bore in the flange extending from the central gas passage to the peripheral edge 0t said flange. Another form of attachment for the auxiliary air valve is therefore shown in Figures 3 and 5 in which the valve stem is threaded and engages a threaded bore in the flange 7. In this case it is not essential even that the threaded portion or the valve shall extend throughout the bore in the flange for the purpose of invention is carried out by having the auxiliary air itselt' traverse the heated passage through said flange.

it is to be understood that the manifold 9, is heated by actual contact with the cylinder walls at connections 17, and by its proximity when assembled to the exhaust manifold not shown, thus permitting the flange 8 to impart heat to the incoming stream of the auxiliary air.

it is within the scope of the invention that various changes may be made in the form and relation of parts to suit different requirements of use, and that the invention, there fore, is not limited to the precise details of construction and arrangement shown.

Having described my invention wl at I daimas new and desire to secure byrLetters Patent, is 1 1. In an internal combustion engine, a fuel mixture conduit, having a portion thereof arranged in heat-receptive relationship to said engine, said portion being constructed with an integral connecting flange surrounding the gas-passage therethrough, the wall of said flange surrounding said passage being serrated, a duct formed in said flange ex tendingtrom the peripheral edge thereof to said gas passage the outer end of said duct communicating with the atmosphere.

2. In an internal combustion engine a tuel mixture conduit having a portion thereof arranged in heat-receptive relationship to the engine and providedwith an integral connecting flange surrounding the gas passage therethrough, thewall of: said gas pas age through said flange being serrated, said flange being constructed with a channel leading from said gas passage to the peripheral.

edge ot said flange, a tubular member seated in said channel and trictionally engaging the walls thereof, said tubular member being open at its outer end to the atmosphere and provided with an inwardlyopening check valve. V

in testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. l

ERNEST O. ATWQOD.

\Vitnesses:

ll. W. JACKSON, B. M. HliwLnY, 

